If the thermostat is also activated the sl terminal on the boiler is connected to line and the boiler operates.
Combi boiler room thermostat.
This is called a single channel programmer.
Traditionally the thermostat is connected to the boiler by wires running through the walls of the home.
You can find out more about combination boilers and the best brands on our dedicated combi boilers page.
3 wire thermostat and programmer.
A 2 wire thermostat is connected between line and the switched line terminal on the boiler.
A boiler thermostat helps in controlling the boiler operation thus maintaining a proper set temperature inside the home.
A programmable thermostat for a combi boiler need only control the heating as the hot water is instantaneous.
Trvs are those nozzles located on the bottom of radiators usually with numbers 1 5 and an asterisk on them.
While your boiler thermostat and room thermostat are ways to control the temperature of your entire home and hot water thermostatic radiator valves trvs allow you to manage the temperature of individual rooms.
Thermostatic radiator valves in all rooms except the one with the room thermostat.
A boiler interlock motorised valves.
We have a great range of wireless thermostats available that make it easier to control your heating remotely.
When heat is required the thermostat connects these two wires together applying the full mains voltage to the switched line terminal.
They work by automatically sensing the air temperature and when the temperature falls to a pre determined setting the thermostat will tell the heating to turn on.
This is the same operation as the volt free system except in this case line voltage is applied to the controls and boiler.
This activates the boiler.
The location of the thermostat is very important as the following examples show.
The table below shows a selection of standard and smart programmable thermostats from honeywell baxi ideal nest tado and drayon.
The boiler only operates if both the programmer and thermostat are on.